US STOCKS-Tech leads Wall St lower as Ukraine casts a shadow
* Ukraine conflict continues; Russia seizes marine base
* Nasdaq hit as Internet, biotech names tumble
* Procter & Gamble rallies and helps limit the Dow's loss
* Dow off 0.2 pct; S&P 500 down 0.5 pct; Nasdaq off 1.2 pct (Updates to close)
By Angela Moon
NEW YORK, March 24 (Reuters) - U.S. stocks fell on Monday, with some of the market's recent best performers like technology and biotech shares leading the way down.
Concerns that the crisis in Ukraine could escalate gave investors a reason to drop some of the market's biggest trading favorites. The Nasdaq fell below its 50-day moving average earlier, in a sign of weakening near-term momentum.
Netflix Inc tumbled 6.7 percent to close at $378.90, with fellow Internet names Facebook Inc down 4.7 percent at $64.10 and TripAdvisor Inc down 3.9 percent at $97.58. All three had scored sharp gains in 2013.
The Nasdaq biotechnology index, which jumped 66 percent last year, fell 3 percent in its fourth straight daily decline. Over those four sessions, the biotech index slid 9 percent. On Friday, the index marked its worst day since October 2011. Continuación...